Create Treehouse

You plant a seed of any kind of tree that is capable of growing taller than 30ft.  After you start casting the spell, you must be inside a 20ft radius from the seed for the duration of the casting.

The caster can cast any 1 action or bonus action spell while casting this spell, and the caster will not gain a level of exhaustion by working more than 8 hours per day. But still gaining exhaustion by not sleeping.

For the next 10days, the tree will grow into a 30ft radius wide, 20ft tall tree that is hollow and durable to withstand a category 4 storm.
The treehouse becomes a structure and not a living tree anymore.